shear pin

Lorna planted several pin flags, then we continued cruising.

Though, as everybody well knew, the doctor had forbidden her to lift so much as a pin!

He held the pin delicately between finger and thumb, and controlled her with his roguish eyes.

The scolex is about the size of a pin-head, and is surrounded by four sucking discs, but has no hooklets (Fig. 96).

A grain—requiring to be picked out with a pin and microscope—of truth, with a bushel of bunkum or cant.

Welcome jerked himself away from the book, whirled around on his wooden pin and pointed his knife at the book-shelves.